Radon concentrations were measured at different locations in a house using CSR solid track detectors with and without electret. The results show that radon concentrations differ even in the same room; in the middle of the room, they decrease with increasing height from the floor. Radon concentrations at the height of 0.88 m (i.e. about the breathing height when the resident is sleeping) are about 1.3-1.5 times that at 0.5 m below the ceiling. They are the highest at the head of a bed close to the wall where the sleeper's head usually lies, viz. 1.6-1.8 times that at 0.5 m below the ceiling. The radiation dose to the inhabitants, estimated in accordance with the average radon concentration measured at the 0.5 m location below the celling, should therefore be multiplied by a correction factor of about 1.5 to obtain the realistic dose.

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